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Table 1 Proteins identified in the first trypsin digest with and without a sodium carbonate wash step.

From: Elucidation of the outer membrane proteome of Salmonella enterica serovar Typhimurium utilising a lipid-based protein immobilization technique

Protein type Sample Group
  HPLC grade water wash Sodium Carbonate wash
  Incl 1 peptide >1 peptide Incl 1 peptide >1 peptide
All types 301 198 233 142
Non-membrane 253 168 134 81
Membrane-associated 48 30 99 61
OMP 26 14 54 42
% Non-membrane 84% 85% 58% 57%
% Membrane-assoc. 16% 15% 42% 43%
% OMP 9% 7% 23% 29%